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Variable Hawk

Geranoaetus polyosoma
(Quoy, JRC; Gaimard, JP, 1824)
Aguilucho Común
Gavião-de-costas-vermelhas

Family: Accipitridae
Order: Accipitriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

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Conservation status according to BirdLife International: Least Concern

Other common names: Ñanco, Aguilucho Variable.

Synonyms: Buteo polyosoma, Falco polyosoma.

Subspecies:


Description: It is a large, long-winged raptor with a slender profile and remarkable plumage variability. Individuals range from mostly ash-gray to rufous or chestnut tones, with lighter or darker underparts depending on morph. In flight, it is recognized by its slightly raised wings forming a shallow “V”, relatively short tail, and pale patches at the base of the primaries. Juveniles tend to be browner and more streaked.

Geographic distribution: It is widely distributed across South America, from southern Colombia and Venezuela to southernmost Chile and Argentina. It is especially common along the Andes, but also inhabits Patagonian steppes, intermontane valleys, and open lowlands.

Habitat: It occupies open and semi-open habitats, including grasslands, shrublands, agricultural areas, and mountainous regions. It tolerates a broad altitudinal range, from sea level to over 4,000 m, efficiently using thermal currents for soaring.

Diet: It is an opportunistic predator, feeding mainly on small mammals (particularly rodents), medium-sized birds, reptiles, and large insects. It also scavenges when opportunities arise, which increases its dietary flexibility.

Behavior: Usually seen alone or in pairs, though it may gather where food is abundant. It spends long periods soaring with a powerful yet economical flight, and maintains large territories during the breeding season.

Nesting: It builds large stick nests, typically on rocky cliffs, escarpments, or occasionally tall trees and human-made structures. Clutches usually consist of one to two eggs, with shared parental care and an extended fledging period.

Conservation status: It is classified as Least Concern globally due to its wide range and generally stable populations, although local threats include persecution, electrocution, and habitat alteration.


Author of this compilation: EcoRegistros – 15/12/2025




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Last published photographs

Foto
Photography ID: 609939
  Adult

Puente Picheuta
Mendoza
Argentina
09/08/2024
Edgar Romeo
Foto
Photography ID: 584213
  Adult

Camino a Iruya
Jujuy
Argentina
04/23/2024
Edgar Romeo
Foto
Photography ID: 584211
  Immature

Abra Pampa
Jujuy
Argentina
04/22/2024
Edgar Romeo
Foto
Photography ID: 531712
  Juvenile

El Taco
Catamarca
Argentina
03/05/2023
Edgar Romeo
Foto
Photography ID: 487820
  Immature

Añelo
Neuquén
Argentina
03/03/2022
Edgar Romeo
Foto
Photography ID: 460716
  Juvenile

Arenas Verdes
Buenos Aires
Argentina
09/03/2021
Edgar Romeo
Foto
Photography ID: 460715
  Juvenile

Arenas Verdes
Buenos Aires
Argentina
09/03/2021
Edgar Romeo
Foto
Photography ID: 440422
  Adult

Los Altares
Chubut
Argentina
02/20/2021
Edgar Romeo
Foto
Photography ID: 347160
 

Dique El Cadillal
Tucumán
Argentina
05/14/2018
Edgar Romeo
Foto
Photography ID: 295549
  Adult

Piedra del Águila
Neuquén
Argentina
10/12/2018
Edgar Romeo
Foto
Photography ID: 293787
  Adult

El Bolsón
Río Negro
Argentina
10/15/2018
Edgar Romeo



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 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
219629512/09/2024ArgentinaSan LuisParque Nacional Sierras de las QuijadasEdgar Romeo
219629808/09/2024ArgentinaMendozaPuente PicheutaEdgar Romeo
203449723/04/2024ArgentinaJujuyCamino a IruyaEdgar Romeo
203449522/04/2024ArgentinaJujuyRuta 7 hacia Laguna de los Pozuelos, Abra PampaEdgar Romeo
174857905/03/2023ArgentinaCatamarcaEl TacoEdgar Romeo
156496903/03/2022ArgentinaNeuquénPor ruta 7, AñeloEdgar Romeo
145869303/09/2021ArgentinaBuenos AiresEntrada arenas verdes, Arenas VerdesEdgar Romeo
139299020/02/2021ArgentinaChubutLos AltaresEdgar Romeo
82484915/10/2018ArgentinaRío NegroEl BolsónEdgar Romeo
83022412/10/2018ArgentinaNeuquénPiedra del ÁguilaEdgar Romeo
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 10/04/2026.